Kiselev, Gennady – Azarov, Sergei

2453 2008 · Black wins (resignation, time or agreement)

Scandinavian, 2008: Kiselev (2453) against Azarov (2585). After 2...Qxd5 3.Nc3 Qa5 the queens come off early (14.Qh5, then 15.Qxf5), leaving a rook endgame where Black pushes the h- and g-pawns. It looks under control until 35...Rg6, a missed opportunity that swings the evaluation from -0.6 to +3.4 — Black’s entire edge gone in one move. White then plays 36.Ke3, another missed chance, from -3.4 to +0.3, and the balance returns. Azarov, at 83% at-least-good moves against 78%, converts from there (0-1). The takeaway: in rook-and-pawn endings, one loose move can erase everything you built.